The cross section for charge exchange in the reaction He + +H - to He+H has been measured over a range of relative velocities from 2.2 to 14.0*10 7 cm s -1 (0.2 to 8.0 keV barycentric energy). The technique of modulated inclined ion beams developed for the observation of H + -H - collisions was used. The cross section falls from a value of 127*10 -16 cm 2 at 2.2*10 7 cm s -1 to 9.7*10 -16 cm 2 at 14.0*10 7 cm s -1 and exhibits prominent structure at intermediate velocities. The results are compared with those previously obtained for the H + -H - system.
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Gaily et al. (1970) studied this question.
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